Update HTTP Client cURL implementation:

Added the option to set cipher list used to negotiate security settings
(SSL handshake)

library/network/http_client/src/http_client_session.e

@@ -272,6 +272,15 @@ feature -- Authentication
 			-- Associated optional credentials value.
 			-- Computed as `username':`password'.
 
+	cipher_list: detachable READABLE_STRING_32
+			-- SSL cipher preference lists
+			-- examples: DEFAULT, ALL, TLSv1
+			-- check https://www.openssl.org/docs/man1.1.0/apps/ciphers.html
+			--! At the moment only used for LIB_CURL_HTTP_CLIENT
+			--! Net implementation set all the ciphers using the OpenSSL at
+			--! initialization time.
+
+
 feature -- Status setting
 
 	set_is_debug (b: BOOLEAN)
@@ -401,6 +410,13 @@ feature -- Element change
 			chunk_size := a_size
 		end
 
+	set_cipher_list (a_list: READABLE_STRING_GENERAL)
+		do
+			create {STRING_32} cipher_list.make_from_string_general (a_list)
+		ensure
+			cipher_list_set: attached cipher_list as c_list and then c_list.same_string_general (a_list)
+		end
+
 note
 	copyright: "2011-2017, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"

library/network/http_client/src/spec/libcurl/libcurl_http_client_request.e

@@ -372,6 +372,11 @@ feature -- Execution
 				curl_easy.setopt_integer (curl_handle, {CURL_OPT_CONSTANTS}.curlopt_ssl_verifypeer, 0)
 			end
 
+			--| Cipher List
+			if attached session.cipher_list as c_list then
+				curl_easy.setopt_string (curl_handle, {CURL_OPT_CONSTANTS}.curlopt_ssl_cipher_list, c_list )
+			end
+
 			--| Request method
 			if request_method.is_case_insensitive_equal ("GET") then
 				curl_easy.setopt_integer (curl_handle, {CURL_OPT_CONSTANTS}.curlopt_httpget, 1)